V belt clutch pulley



Oct. 14, 1941. H, A, `czEDERsTRoM 2,259,149

` v BELT CLUTCH PULLEY Filed Jun 12, 1939 s sheets-sheet 1 5 Oct 14, 1941- H. A. cEDERsTRoM V BELT CLUTGH PULLEY Filed June 12, 1939 3 Sheets-Sheet 2 l l 155/; :fifi: JM J4/L C Jia 55u19 j Oct. 14, 1941. H. A. cEDERsTRoM 2,259,149.

v BELT CLUTCH PULLEY Filed June 12, A1939 3 sheets-sheet 3 Patented Oct. 14,1941

v BELT CLUTCH PULLEY Harold A. Cederstrom, deceased, late oi' Minneapolls, Minn., by Horace W. Cederstrom, administrator, Minneapolis, Minn.

vAplJlicatiol-i June 12, 1939,`Seria1 No. 278,730

7 Claims. (C1. I4- 2165) 'rms invention relates to v bell. clutch pulleys.

It is the general object of the invention to provide a novel V belt clutch pulley of inexpensive. simple and compact construction which can be utilized leither as a driving pulley or a driven pulley in connection with a V belt and which if utilized asa driving pulley can when shifted to one position drive the V belt as the pulley rotates and which when shifted to another Vposition willallow the V belt .to idle while the pulley is being rotated, and which when used as a driven pulley when shifted to one position will be driven by the V belt and which when shifted to a second position will permit the V belt to turn idle without driving the pulley.

A more specific object of the invention is to provide a V beltclutch pulley which can be shifted from driving to idling relation with great ease and without materially affecting the alinement of the V belt running over thepulley.4

Another object is to provide a multiple V belt clutch pulley of small, compact' form for use in driving relation. or idling relation, in conjunction with a plurality of V belt drives.

A further object is to provide a simple and effective mechanism for shifting a V belt clutch pulley of the single or multiple type.

The objects and advantages of the invention will more fully appear from the following description made in connection with the accomy .panying drawings wherein like reference charof the multiple pulley shown in Figs. 4 and 5;

Fig. 9 is a section taken on the line '9-9 of Fig.

8 as indicated by the arrows.

Referring first to the embodiment of the invention shown inFlgs. 1, 2 and 3 a shaft I0 is illustrated which shaft may be either a driving shaft or a driven shaft. Secured as by a set screw II to the shaft I0 is a sleeve'IZ which carries a fixed disc I3, this disc being shown las being integrally formed with the sleeve inthe illustrated embodiment. A sliding disc I4 is mounted on the sleeve I2 for rotation therewith and for sliding movement thereon within limits and for this purpose the disc Il is equipped with a hub having a splined channel I5 therein within which a spline I6 carried by the sleeve I2 works. The two discs I3 and I4 face each other in opposing relation and the outer portions of the opposing faces of these discs are designated ISa and Ila respectively and these portions I3aand Ida extend in outwardly diverging relation from the axis of acters refer to the same or similar parts throughout the various views and in which, l

Fig. 1 is a vertical section taken through a V belt clutch pulley' of the single type embodying the invention and showing the clutch pulley shlftedto the driving position;

Fig. 2 is a similar view but showing the pulley shifted to idling relation;

Fig. 3 is a transverse section taken substantially on the line 3-3 in Fig. l as indicated by the arrows:

Fig. 4 is a vertical longitudinal section taken through a multiple V belt clutch pulley embodying the invention and showing the same shifted to driving relation; p

Fig. 5 is a view partly in side elevation and partly in vertical section of portions of the same multiple clutch pulley but showing the same shifted to idling DOSition;

F18. 6 is a face view of one of the nxed discs of the multiple pulley shown in Figs. 4 and 5;

Fig. 'l is a section taken on the line I-'I of Fig. 6 as indicated by the arrows:

F18. 8 is a face iew of one of the sliding discs 65 rotation of the shaft I0 and form a pulley groove within which a V belt shown in dotted lines and designated by the letter A may be received.

Inwardly from the face portions I3a and Ila; the two discs I3 and, Il are provided with recesses i3d and Hb respectively and a ring Il located between the two discs I3 and Il is received within the recesses I3b and Ilb and forms in effect the bottom of the pulley groove. The peripheral edge of this ring 'is slightly crowned, as shown, and the ring is free to rotate relative to the two discs I3, Il, and the sleeve I2. While it is possible to journal the ring I1 on the sleeve I2 in any suitable manner, in the illustrated emb odiment a ball bearing is used for this purpose,

the outer race I8 of the ball bearing being carried by the ring I 'I, the inner race i9 of the ball bearing being carried by the sleeve I 2 and the balls 20 of the bearing, ofcourse, being located in the channels formed in the opposing faces of the two races I8 and Il. l

To shift the sliding disc Il a collar 2l is employed which is looseLv mounted on the ysleeve I2 to the right of the sliding disc Il as viewed in the-drawings. This collar has a stop ange 2Ia at. one end thereof and is provided with a groove adjacent the other end thereof within which a split spring ring 22 is received forassembled retention purposesas will hereafter appear.

The Y collar 2l is provided with a pluraltiy of ball re` recesses 2lb, the balls will not project beyond the outer surface of the collar 2|.

A'shipper ring 25 receives the collar 2| and this shipper ring is provided with the usual peripheral groove 25a within which rollers 26 carried by pins 21 mounted on a shipper fork 28, work. By swinging the shipper fork 28, the shipper ring 25 can be slid from the position shown in Fig. 1 to the position shown in Fig. 2. The left inner edge of the ring 25, as viewed in the drawings, is chamfered to provide a cam surface 25h which at times Works against the balls 23 and at the same time to provide clearance for movement of the balls 23 from the position shown in Fig. 1 to the position shown in Fig. 2.

A coil spring 29 encircles the sleeve I2 between the right end of the sliding disc I4 and the left end of the collar 2| and this spring, of course, has bearing at one end against the sliding disc I4 and at its other end against the collar 2|. The spring 29 is of such length that when the parts are in the position shown in Fig. 1- the spring will exert considerable tension on the sliding disc I4 to hold it in its position as shown in Fig. -1 slid to the left, but when the' parts are in the position shown in Fig. 2 the tension on the spring 29 is relieved so that it will exert no, or very little force, against the sliding disc I4 to tend to slide it to the left. p

At the right end ofthe sleeve I2 a groove is provided receiving a split circular spring 30 which acts as a stop limitingsliding movement of the collar 2| to the right as viewed in the drawings.

Let usassume that the belt A is being driven as by another pulley and that the shaft I0 is to be driven by the belt. The parts of the V belt clutch pulley will then take the position shown in Fig. l. The balls 23 will be partially received within the ball groove 24 of the lsleeve I2 and partially received within the ball recesses 2|b of the collar 2|. These balls 23 will be retained in this position by the inner surface of the shipper ring 25 and, of course, the balls willA act to lock the collar 2| in the position shown in Fig. 1 so that the collar cannot be slid on the sleeve I2 unless the shipper ring 25 is shifted from its position shown in Fig. 1. The spring 29, exerting its tension on the sliding disc I4, will hold the disc slid as closely to the fixed disc I3.as is possible and the size of the belt A is such relative to the particular parts of the clutch pulley for use with this belt that the groove of the pulley formed by the two discs I3 and I4 will be of such a width that the sides of theV belt A must run on the surfaces I3a and I4a without the belt striking the ring Il. Accordingly the belt A will drive the pulley and the shaft I!) will be driven. Attention should be called to the fact that if the load on the shaft :I0 becomes so great that the power of the spring 29 is overcome the sliding disc |4a will automatically shift slightly to the right against the tension of the spring 29 and the V belt A will then ride down onto the ring II and will slip relative to the pulley formed by the discs I3 and I4 so that no damageA can be done through overloading the shaft I 5. This is quite an important feature of the present clutch pulley inasmuch as breakage of parts is prevented incase there is an obstruction to the movement of any part driven by the shaft ID.

When it is desirable to idle the shaft Iii while still permitting the belt A to turn it is only necessary to shift the shipper fork 28 to the right from the position shown in Fig. 1 to the position shown in Fig. 2. As the shipper fork moves to the right the ring 25 is slid relative to the collar 2| until the ring abuts the iiange 2Ia. Thereupon the cam surface 25h of the ring overlies the balls 23 and as continued movement of the shipper ring 25 continues the collar 2| will slide to the right relative to the sleeve I2. The left hand portion of the collar 2| will cam the balls 23 out of the groove 24 to take the position shown inFig. 2, partiallyr received within the chamfered portion of the ring 25 and -partially receivedwithin the ball recesses 2|b. As the parts move to the position shown in Fig. 2 the tension on the spring 29 is relieved and the sliding disc I4 moves away from the fixed disc I3 to widen the V belt groove of the pulley. Accordingly the V belt rides down onto the surface of the ring I'I and as this ring is journaled for free rotation relative to the discs I3 and I4 and the sleeve I2, the pulley will not be driven and of course the shaft I0 will not be driven.

When it is again desired to drive the shaft I0 the shipper fork 23 is swung to the left from its position shown in'Fig. 2 and as this occurs the ring 25 acting'against the balls 23 slides the collar 2| with the ring until the balls 23 arrive at Aa point in line with the ball groove 24. The

cam ysurface 25h of the ring 25 then forces the balls 23 into the groove 24 whereupon the ring 25 slides over the balls 23 to retain the balls in such a position that they lock the sleeve 2| from sliding movement. Movement of the collar 2| to left again places the spring 29 under tension and the sliding disc I4 is accordingly slid toward thev fixed disc I3 to narrow the V belt groove of the pulley and cause the V belt A to climb from the journaled ring I'I to such a point that the sides of the V belt engage the portions |3a. and I 4a of the two discs to drive the pulley and shaft.

It will, of course, be seen that when the shaft I0 is used as a driving shaft for driving the V belt A from the clutch pulley, the belt A will be driven when the parts are in the position shown in Fig. l and the V belt A will not be driven when the parts are as shown in Fig. 2.

Referring now to the multiple clutch pulley illustrated in Figs. 4 to 8, there is shown a shaft 3| which may be either a drive shaft or a driven shaft. Secured as .by a key 32 to the shaft 3| is a fixed disc 33, and secured as by bolts 34 to the disc 33 are a plurality of other fixed discs 35 and 36. It, of course, is understood that any desired number of xed discs corresponding to'discs 35 and 3S can be employed. Secured to the shaft 3| is a feather spline 3'I which is received within spline groovesin sliding discs 38, 39, and 49, there being the same number of sliding discs as there are fixed discs. The disc 33 mates with the disc 38 to form a pulley, the disc 35 mates with the disc 39 to form a second pulley and the disc 35 mates with the disc 49 to form a third pulley. The two xed discs 35 and 3G are, of course, identically similar and are very similar to the fixed disc 33 with the exception that thev discs 35 and 36 instead of being fixed directly to the shaft 3|, as is the disc 33, are secured to the disc 33. Also the two sliding discs 38 and 39. are identically similar and are similar to the remaining sliding disc 43 with the exception that the disc 43 'has a chamfered right hand outer edge and has a somewhat elongated hub portion, while the discs 33 and 33 do-not have chamfered outer edges on the right hand faces, nor are the hubs of these discs extended fromthe right hand faces of the discs as inthe case of the disc 43. The three v, fixed discs 33, 35 and 33 have central ring-like flanges 33a, 35a and 33a,'resp ective1y, on which 'rings 4i, 42 and 43, respectively, are journaled.

Formed integrally with the ring-like flanges 33a,

'35a and 36a, are segment-like extensions 33h, 33h,

41 in the same manner as does-the spring 23 in the previously described construction.

When the shipper ring 33 is slid to the left as shown in Fig. 4 the spring 5I, exerting pressure against the disc 43 and from the disc 43 against the disc 33 and from the disc 33 against the disc 33, forces the slidingdiscs 33, 33 and 43 respectively toward the vfixed discs 33,V 33 and 33 with which they mate to maintain the pairs of discs in closely spaced relationship and thus to maintain the pulleys formed by the mating discs in driving engagement with the V belts to contact the sides of the V belts with the opposed portions 33d and 38d, 35d and' 33d, and 33d and 43d of the respective pu1leys. When the shipper ring 53 is slid to its extreme right'hand position the tension on the spring 5I is relaxed so that the sliding discs 33, 33 and 43 may move to the posiceive at times the rings 4I, 42 and 43. The adjacent faces of the two discs 33 and 35, and the two discs 33 and 33 are provided with staggered interlocking segments 33e, 35e, 33e and 33e, respectively, for interfltting engagement at times. With this arrangement it will be seen that the various discscanbe assembled together with the rings 4i, 42 and 43, and that the discs 33, 33 and 43 are capable of limited sliding movement longitudinally of the shaft 3l relative to thediscs 33, 33 and 33. It should be stated that the sliding discs 33, 33 and 43 have hub portions 33e, 33e and 43e,

respectively, which are received respectively within a central recess in the fixed disc 33, and within central openings in the fixed discs 33 and 33.

Thev outer portions of the opposing faces of the discs 33 and 33, 33 and 33, and 33 and 43, extend outwardly in diverging relation from the axis of rotation of the shaft 3i and form pulley groove surfaces 33d 4and 33d, 35d and 33d, and 33d and 43d, respectively, for reception of V belts. The bottoms of these pulley grooves are formed by the outer surfaces of the various rings 4|, 42 and 43, respectively, said surfaces being preferably crowned as shown for the purpose.

To shift the multipleclutch pulley a structure is employed which is very similar to that em ployed in conjunction 'with the single clutch pulley previously described.. This structure is best shown in Fig. l4 and ,includes a sleeve 44, se-

cured as by set'screw 45 to the Shaft 3| at the right of the multiple pulley as illustrated in the drawings. This sleeve 44 is provided with a bailreceiving groove 44a corresponding to the ball groove 24 of the previously described construction and carried in a groove near the right end ofthe sleeve 44 is a split spring ring 43 corresponding tion shown in Fig. '5 to widenthe grooves of the pulleys and allow the V belts to drop down to ride on the journaled rings 4|, 42 and 43 respectively whereupon the pulleys will no longer be in driving engagement with the belts. It should be noted that when the various belts are idling the alineinent of the various belts-is shifted merely a veryl slight distance longitudinally of the shaft 3l winch is highly important in devices of this type. Also because of the use of the spring 3| which backs the disc 43 when the multiple pulley is in driving relation individual adiustment of the width of the groove in each pulley to meet the requirements of the particular belt Aemployed is automatically secured.

Multiple pulleys for driving any desired number of belts may' be made by adding additional discs 35 and 33 andan additional ring 42 for each additional pair of discs.

It will be seen that an exceedingly simple.

` compact and economical V belt clutch pulley has been provided which is capable of use effectively to the ring 33 of the previously described construction. A collar 41 correspondingl to the collar 2| of the previous construction is mounted on the sleeve 34 and it has a stop' flange 41a at one end thereof and is provided with agroove adjacent its other end within which a split spring ring 43 This collar 41 has ball recesses 41h is received. therein within which balls 43 are partially received. A shipper ring 33 which is identical to the' shipper ring 25 of the previous construction receives the collar 41 and this ring is provided as inthe case of the previously described ring 25. A coil spring 5I vsurrounding the shaft 3l reactsbetween the disc 43 and the left end of the collar tremely simple' and effective mechanism has been provided for shifting a clutch pulley. Devices of the invention havebeen successfully demonstrated in actual practice and have been found to be successful for the purpose intended.

It will of course be understood that various changes may be made in the form, details, arrangement and proportions of thevarious parts without departing from the scope of the present invention which generally stated consists in the matter shown and described and set forth in the appended claims.

What is claimed is:

1. A multiple V belt clutch pulley comprising a plurality of pairs of V beit pulley discs. the discs of adjacent pairs being independent of each other and having no connection and one disc of `each pair being mounted for limited sliding movement to and from the other disc of the pair,

the outer facing portions of each pair of discs v combining to form a V belt pulley groove, a ring journaled between the two discs of each pair for free rotation relative to the same and forming the bottom 0f the pulley groove produced bythe pair of discs. means for Vmaintaining all the sliding discs in closely spaced relation relative ltoy the remaining discs of the pairs. and means for 4 rendering said first mentioned means inactive to permit sliding movement of the sliding. discs away from the remaining discs of the pairs.

. 2. A multiple V belt clutch pulley comprising a plurality of pairs of V belt pulley discs, one

disc of each pair being mounted for limited sliding movement to. and from the other disc ofthe pair, and the other disc of each pair being nonslidable, the outer facing portions of each pair of discs combining to form a V belt pulley groove, a ring journaled between the two discs of each pair for free rotation relative to the same and A forming the bottom of the pulley groove produced by the pair of discs, resilient means normally urging the sliding discs of each pair toward the remaining discsthereof, and means for rendering said resilient means inactive.

3. A multiple V belt pulley clutch comprising a shaft, a plurality of pairs ofV belt pulley discs, one disc of each pair being mounted for limited sliding movement to and from the other disc of the pair, and the other disc of each pair being mounted to prevent sliding movement relative to the shaft, the outer facing portions of each pair of discs combining to form a V 'belt pulley groove,

, all of said discs being mounted for rotation with said shaft, a ring journaled between the two discs of each pair for free rotation relative to the same and forming the bottom of the pulley groove produced by the pair of discs, resilient means for urging all of said sliding discs toward the cooperating discs of said pairs and means for rendering said last mentioned means inactive, said sliding disc having portions slidably recessed between adjacent discs with which said sliding discs cooperate.

4. A multiple'V belt pulley clutch comprising pairs of adjacent fixed and sliding lpulley discs, means for securing one of said xed discs to a shaft, removable means for securing said xed discs together and permitting assembly of a sliding disc between adjacent 'fixed discs, each pair of fixed and sliding discs cooperatingto form a V belt pulley groove, a plurality of rings one of which is journaled forl rotation relative to said pulley discs between the two discs of each pair and which rings form the bottoms of said grooves, means for simultaneously shifting all lof said sliding discs'to and from said xed discs and means for sliding said sliding discs to positions closely adjacent said xed discs.

5. In a V belt clutch pulley including a fixed pulley disc and a sliding pulley disc, means for moving and latching the sliding disc comprising and to said recesses that when they are partially received within said groove they will not project beyond the periphery of said collar, a shipper ring slidably mounted on said collar for shifting movement over said recesses and laterally thereof, said shipper ring being charnfered at one inner edge to form .a ball camming surface and space within which the balls may bepartially received when said shipper ring is shifted to one side of said recesses, means limiting the sliding movement of said shipper ring, and means for sliding said shipper ring.

6. A V belt pulley clutch comprising a shaft, a fixed pulley disc secured thereto, a slidable pulley disc mounted for rotation with said shaft and for sliding movement thereon to and from said fixed disc, said twodiscs having opposed outwardly diverging face portions to form a V belt pulley groove, a ring journaled on said shaft between said two `discs and having a peripheral surface forming the bottom of said groove, a collar mounted for sliding movement on said shaft, said collar having radial ball receiving recesses therein, balls carried Within said recesses, said shaft having a ball receiving groove therein, a coil spring surrounding said shaft and disposed between said collar and said slidable disc, a shipper ring overlying said collar and of less width than said collar, said shipper ring having at one side thereof a ball camming portion acting to cam the balls into said groove when said shipper ring is slid in one direction, means limiting the sliding movement of said shipper ring relative to said collar and means limiting the sliding movement of said collar away from'said sliding disc. i

'7. A multiple V belt clutch pulley comprising a plurality of pairs of V belt pulley discs, one disc of each pair being mounted for limited slid- 'ing movement to and from the other disc of the pair, and the other disc of each pair being nonslidable, the outer facing portions of each pair of discs combining to form a V belt pulley groove, a ring journaled between the two discs of each pair for free rotation relative to the same and forming the bottom of the pulley groove produced by the pair of discs, means for maintaining all of the sliding discs in closely spaced relation relative to the remaining discs of the pairs. and means for rendering such rst mentioned means inactive to permit sliding movement of the sliding discs away from the remaining discs of thepairs.

HORACE W. CEDERSTROM. Administrator of the Estate of Harold A. Cederstrom, Deceased. e 

